2010 Yates and Thurlow Reservoirs...

2010 Yates and Thurlow Reservoirs Report Rivers and Reservoirs Monitoring Program

Field Operations Division Environmental Indicators Section

Aquatic Assessment Unit April 2013

22001100 RRRRMMPP:: TTaallllaappoooossaa BBaassiinn RReeppoorrtt

2

Rivers and Reservoirs Monitoring Program

2010

Yates and Thurlow Reservoirs Tallapoosa River Basin

Alabama Department of Environmental Management Field Operations Division

Environmental Indicators Section Aquatic Assessment Unit

April 2013


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Table of Contents

LIST OF ACRONYMS ................................................................................................................ 4

LIST OF FIGURES ...................................................................................................................... 5

LIST OF TABLES ........................................................................................................................ 6

INTRODUCTION......................................................................................................................... 7

METHODS .................................................................................................................................... 8

RESULTS .................................................................................................................................... 11

REFERENCES ............................................................................................................................ 24

APPENDIX .................................................................................................................................. 26


4

LIST OF ACRONYMS

A&I Agriculture and Industry water supply use classification ADEM Alabama Department of Environmental Management AGPT Algal Growth Potential Test APCo Alabama Power Company CHL a Chlorophyll a DO Dissolved Oxygen F&W Fish and Wildlife MAX Maximum MDL Method Detection Limit MIN Minimum MSC Mean Standing Crop NTU Nephelometric Turbidity Units OAW Outstanding Alabama Waters ONRW Outstanding National Resource Water PWS Public Water Supply QAPP Quality Assurance Project Plan RRMP Rivers and Reservoirs Monitoring Program S Swimming and Other Whole Body Water-Contact Sports SD Standard Deviation SOP Standard Operating Procedures TEMP Temperature TN Total Nitrogen TMDL Total Maximum Daily Load TP Total Phosphorus TSI Trophic State Index TSS Total Suspended Solids USACE United States Army Corp of Engineers USEPA United States Environmental Protection Agency USGS United States Geological Survey


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LIST OF FIGURES

Figure 1. Yates and Thurlow Reservoirs with 2010 sampling locations. ................................ 9

Figure 2. Mean growing season total nitrogen and total phosphurous of all stations in Yates and Thurlow Reservoirs, April-October 1997-2010. ................................................ 13

Figure 3. Mean growing season chlorophyll a and total suspended solids in all stations in Yates and Thurlow Reservoirs, April-October 1997-2010 ................................... 14

Figure 4. Monthly TN concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge................................................................. 15

Figure 5. Monthly TP concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge................................................................. 16

Figure 6. Monthly chl a concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge................................................................. 17

Figure 7. Monthly TSS concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge................................................................. 18

Figure 8. Monthly DO concentrations at 1.5 m (5 ft) for Yates and Thurlow Reservoirs stations collected April-October 2010. ................................................................... 20

Figure 9. Monthly depth profiles of dissolved oxygen, temperature, and conductivity in the lower Yates Reservoir station, April-October 2010 ................................ 21

Figure 10. Monthly depth profiles of dissolved oxygen, temperature, and conductivity in the lower Thurlow Reservoir station, April-October 2010 ........................... 22

Figure 11. Monthly TSI values calculated for mainstem and tributary Yates and Thurlow Reservoir stations using chl a concentrations and Carlson’s Trophic State Index calculation ......................................................................................................................... 23


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LIST OF TABLES

Table 1. Descriptions of the 2010 monitoring stations on Yates and Thurlow Reservoirs. ................................................................................................................................... 10

Table 2. Algal growth potential test results, Yates and Thurlow Reservoirs, (expressed as mean Maximum Standing Crop (MSC) dry weights of Selenastrum capricornutum in (mg/L) and limiting nutrient status. ............................................................ 19

Appendix Table 1. Summary of water quality data collected April-October, 2010. ........... 27


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INTRODUCTION

Established in 1928 with the completion of Yates Dam, Yates Reservoir contains

approximately 1,980 acres of surface water. It is the third reservoir on the Tallapoosa River

system in Alabama, located downstream of Martin Reservoir. Thurlow Reservoir, completed in

1930, is located immediately downstream of Yates Reservoir and contains approximately 585

acres of surface water. The 2010 Yates and Thurlow Reservoirs monitoring information is

presented together in this report due to the each reservoir’s small size and close proximity to

each other.

The Alabama Department of Environmental Management (ADEM) monitored Yates and

Thurlow Reservoirs as part of the 2010 assessment of the Alabama, Coosa, and Tallapoosa

(ACT) River basins under the Rivers and Reservoirs Monitoring Program (RRMP). ADEM

began monitoring lake water quality statewide in 1985, followed by a second statewide survey in

1989. In 1990, the Reservoir Water Quality Monitoring Program (now known as RRMP) was

initiated by the Field Operations Division of the ADEM. The current objectives of this program

are to provide data that can be used to assess current water quality conditions, identify trends in

water quality conditions and to develop Total Maximum Daily Loads (TMDLs) and water

quality criteria. Descriptions of all RRMP monitoring activities are available in ADEM’s 2012

Monitoring Strategy (ADEM 2012).

In 2002, the ADEM implemented specific water quality criteria for nutrient monitoring at

the lower Yates and Thurlow locations. These criteria represent the maximum growing season

mean (April-October) chlorophyll a (chl a) concentrations allowable while still fully supporting

both reservoir’s Public Water Supply, Swimming and Fish and Wildlife [PWS/S/F&W] use

classifications.

The purpose of this report is to summarize data collected at three stations in Yates and

one station in Thurlow during the 2010 growing season and to evaluate trends in mean lake

trophic status and nutrient concentrations using ADEM’s 14 year dataset. Monthly and/or mean

concentrations of nutrients [total nitrogen (TN); total phosphorus (TP)], algal

biomass/productivity [chl a; algal growth potential testing (AGPT)], sediment [total suspended


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solids (TSS)], and trophic state [Carlson’s trophic state index (TSI)] were compared to ADEM’s

existing data and established criteria.

METHODS

Sampling stations were selected using historical data and previous assessments (Fig. 1).

Specific location information can be found in Table 1. Yates and Thurlow Reservoirs were both

sampled in the dam forebay. Two tributary embayment stations were sampled on Yates

Reservoir, Channahatchee and Sougahatchee Creeks. Because Sougahatchee Creek has such a

large watershed that contains a rapidly developing urban/suburban area, monthly graphs were

prepared and included in the report along with those of mainstem sampling locations.

Water quality assessments were conducted at monthly intervals April-October. All

samples were collected, preserved, stored, and transported according to procedures in the ADEM

Field Operations Division Standard Operating Procedures (ADEM 2010), Surface Water Quality

Assurance Project Plan (ADEM 2008), and Quality Management Plan (ADEM 2008).

Mean growing season TN, TP, chl a, and TSS were calculated to evaluate water quality

conditions at each site. Monthly concentrations of these parameters were graphed with the

closest available discharge data and ADEM’s previously collected data to help interpret the 2010

results.


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Figure 1. Yates and Thurlow Reservoirs with 2010 sampling locations. A description of each sampling location is provided in Table 1.

THUE-1

YATE-3

YATE-2

YATE-1

E0 1 2 30.5

Miles

Thurlow andYates

Reservoirs

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Table 1. Descriptions of the 2010 monitoring stations on Yates and Thurlow Reservoirs.

Thurlow and Yates Reservoirs

HUC County Station Number

Report Designation

Waterbody Name

Station Description Chl a Criteria

Latitude Longitude

031501100406 Elmore THUE-1* Lower Thurlow Tallapoosa R Deepest point, main river channel, dam forebay . 5 µg/L 32.5376 -85.8893

031501100406 Tallapoosa YATE-1* Lower Yates Tallapoosa R Deepest point, main river channel, dam forebay. 5 µg/L 32.5766 -85.8896

031501100104 Tallapoosa YATE-2 Sougahatchee Ck Sougahatchee Cr Deepest point, main creek channel, Sougahatchee Creek embayment. Approx. 1.6 miles upstream from the Tallapoosa River confluence.

32.6131 -85.8765

031501100402 Elmore YATE-3 Channahatchee Ck Channahatchee Cr Deepest point, main creek channel, Channahatchee Creek embayment, approx. 0.5 miles upstream of lake confluence.

32.6432 -85.8969

*Growing season mean chl a criteria implemented at this station in 2002.

22001100 RRRRMMPP:: TTaallllaappoooossaa BBaassiinn RReeppoorrtt 11

RESULTS

Growing season mean graphs for TN, TP, chl a and TSS are provided in this section

(Figs. 2 & 3). Monthly graphs for TN, TP, chl a, TSS, DO, and TSI are also provided (Figs. 4-8,

11). Mean monthly discharge included as an indicator of flow and retention time in the months

sampled. AGPT results appear in Table 2. Depth profile graphs of temperature, conductivity

and DO appear in Figs. 9 & 10. Summary statistics of all data collected during 2010 are

presented in Appendix Table 1. The table contains the minimum, maximum, median, mean, and

standard deviation of each parameter analyzed.

Stations with the highest concentrations of nutrients, chlorophyll, and TSS are noted in

the paragraphs to follow. Though stations with lowest concentrations may not be mentioned,

review of the graphs that follow will indicate these stations that may be potential candidates for

reference waterbodies and watersheds.

In 2010, the highest mean growing season TN value was calculated for the Sougahatchee

Ck station (Fig 2). Both the lower Yates and Thurlow stations saw a slight increase in growing

season mean TN from 2008. Mean values in Sougahatchee Ck have increased since 2004,

whereas the other three stations have remained relatively stable in concentration since 2000. The

April and October monthly TN concentrations at lower Thurlow were the lowest of the season

(Fig 4). While monthly concentrations were at or above historic means in Sougahatchee Ck,

monthly TN concentrations were generally lower at the lower Yates station, below historic

means four of seven months (Fig 4).

In 2010, the highest mean growing season TP value was calculated for the Sougahatchee

Ck station (Fig 2). Growing season mean TP concentrations at both lower Yates and Thurlow

were the lowest ever calculated (Fig 2). Both stations show a decreasing trend in mean values

since 2002. All monthly TP values at lower Yates and Thurlow were below historic means each

month sampled (Fig 5). The Sougahatchee Ck station had a record high value recorded in June.

In 2010, the highest mean growing season chl a value was calculated for the

Sougahatchee Ck station (Fig 3). Mean concentrations at the other three stations were similar in


both reservoirs. Both lower Yates and Thurlow station values were below established criteria for

chl a. Monthly chl a values were highest ever recorded at the Sougahatchee Ck and lower Yates

station in July, and in July-October at the Thurlow lower station (Fig 6).

In 2010, the highest mean growing season TSS value was calculated for the

Sougahatchee Ck station, the highest recorded at this station since 2000 (Fig 3). The growing

season mean TSS values at the Channahatchee Ck and lower Yates and Thurlow stations, were

the lowest values ever calculated at these stations (Fig 3). All monthly TSS concentrations were

near or below historic mean values at the lower Yates and Thurlow stations, contrasting

Sougahatchee Ck, which observed the highest value recorded for the month of August and above

average values in June, July, and October (Fig 7).

AGPT results for the Channahatchee Ck, lower Yates, and lower Thurlow stations

indicate it was phosphorus limited in all years monitored (Table 2). Due to resource constraints,

AGPT samples were not collected at lower Yates station in August. The Sougahatchee Ck

station was nitrogen limited in 1997 and 2000 and phosphorus limited in 2010. AGPT results

from August 2010 indicate the Sougahatchee Ck exceeded 5mg/L, the value the Raschke et al.

(1996) defined as protective of reservoir and lake systems.

Sougahatchee Ck was below the DO criteria in August and September limit of 5.0 mg/L

at 5.0 ft (1.5 m) (Fig 8) (ADEM Admin. Code R. 335-6-10-.09). DO concentrations at

Channahatchee Ck were below the criteria in June, July, and August. All measurements of DO

concentrations in both lower Yates and Thurlow stations met the ADEM criteria. Lower Yates

and Thurlow stations were thermally stratified June-September (Figs 9 & 10).

Monthly TSI values were calculated using monthly chl a values and Carlson’s Trophic

State Index. Channahatchee Ck showed the largest variation of TSI starting oligotrophic in April

and May, then climbing to eutrophic in July, August, and September (Fig 11). Sougahatchee Ck

increased from oligotrophic conditions in April to highly eutrophic July-October. Lower Yates

station was mesotrophic all sampling season with lower Thurlow station initially oligotrophic

and increasing to eutrophic levels.


Figure 2. Mean growing season total nitrogen and total phosphurous of all stations in Yates and Thurlow Reservoirs, April-October 1997-2010. Bar graphs consist of multiple stations, illustrated from upstream to downstream as the graph is read from left to right.

*Mean of April/June/August only.


Figure 3. Mean growing season chlorophyll a and total suspended solids in all stations in Yates and Thurlow Reservoirs, April-October 1997-2010. Bar graphs consist of multiple stations, illustrated from upstream to downstream as the graph is read from left to right.

*Mean of April/June/August only.

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Figure 4. Monthly TN concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge. Monthly discharge acquired from Alabama Power at Yates Reservoir Dam. Each bar graph depicts monthly changes in each station. The historic mean (1994-2010) and min/max ranges are also displayed for comparison. The “n” value equals the number of datapoints included in the monthly historic calculations.

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Figure 5. Monthly TP concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge. Monthly discharge acquired from Alabama Power at Yates Reservoir Dam. Each bar graph depicts monthly changes in each station. The historic mean (1994-2010) and min/max ranges are also displayed for comparison. The “n” value equals the number of datapoints included in the monthly historic calculations.

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Figure 6. Monthly chl a concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge. Monthly discharge acquired from Alabama Power at Yates Reservoir Dam. Each bar graph depicts monthly changes in each station. The historic mean (1994-2010) and min/max ranges are also displayed for comparison. The “n” value equals the number of datapoints included in the monthly historic calculations. Note the scale in the Sougahatchee station graph is different to better interpret the data.

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Figure 7. Monthly TSS concentrations measured in Yates and Thurlow Reservoirs, April-October 2010 vs. average monthly discharge. Monthly discharge acquired from Alabama Power at Yates Reservoir Dam. Each bar graph depicts monthly changes in each station. The historic mean (1994-2010) and min/max ranges are also displayed for comparison. The “n” value equals the number of datapoints included in the monthly historic calculations. Note the scale in the Sougahatchee station graph is different to better interpret the data.


Table 2. Algal growth potential test results, Yates and Thurlow Reservoirs, (expressed as mean Maximum Standing Crop (MSC) dry weights of Selenastrum capricornutum in (mg/L) and limiting nutrient status. MSC values below 5 mg/L are considered to be protective in reservoirs and lakes (Raschke and Schultz 1987).

Station Channahatchee Ck (YATE-3) Sougahatchee Ck (YATE-2) Lower Yates (YATE-1)

Control mean MSC

Limiting Nutrient Control mean MSC

Limiting Nutrient Control mean MSC

Limiting Nutrient

Aug-1997 --- --- 36.92 NITROGEN 1.29 PHOSPHORUS 2000 --- --- 7.14 NITROGEN 2.52 PHOSPHORUS

Aug-2005 --- --- --- --- 3.35 PHOSPHORUS 2010 3.22 PHOSPHORUS 9.32 PHOSPHORUS --- ---

Station Lower Thurlow (THUE-1)

Control mean MSC

Limiting Nutrient

1997 1.39 PHOSPHORUS 2000 2.53 PHOSPHORUS 2005 4.60 PHOSPHORUS 2010 1.52 PHOSPHORUS


Figure 8. Monthly DO concentrations at 1.5 m (5 ft) for Yates and Thurlow Reservoirs stations collected April-October 2010. ADEM Water Quality Criteria pertaining to reservoir waters require a DO concentration of 5.0 mg/L at this depth (ADEM 2010).

2.00

4.00

6.00

8.00

10.00

12.00

Apr May Jun Jul Aug Sep Oct

DO (m

g/L) @

1.5 m

Yates and Thurlow Reservoirs

Channahatchee

Sougahatchee

Yates Lower

Thurlow Lower

Criteria


Figure 9. Monthly depth profiles of dissolved oxygen, temperature, and conductivity in the lower Yates Reservoir station, April-October 2010.

0

1

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3

4

5

6

7

8

9

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11

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18

10 15 20 25 30 35

Dep

th (

m)

Temperature (C)

Yates Lower2010

04/19/2010 05/17/2010

06/21/2010 07/19/2010

08/16/2010 09/20/2010

10/18/2010

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Dep

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m)

Conductivity (umhos)

Yates Lower2010

04/19/2010 05/17/2010

06/21/2010 07/19/2010

08/16/2010 09/20/2010

10/18/2010

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m)

Dissolved Oxygen (mg/L)

Yates Lower2010

04/19/2010 05/17/2010

06/21/2010 07/19/2010

08/16/2010 09/20/2010

10/18/2010


Figure 10. Monthly depth profiles of dissolved oxygen, temperature, and conductivity in the lower Thurlow Reservoir station, April-October 2010.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

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0 5 10 15

Dep

th (

m)

Dissolved Oxygen (mg/L)

Thurlow Lower2010

04/19/2010 05/17/2010

06/21/2010 07/19/2010

08/16/2010 09/20/2010

10/18/2010

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08/16/2010 09/20/2010

10/18/2010

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Thurlow Lower2010

04/19/2010 05/17/2010

06/21/2010 07/19/2010

08/16/2010 09/20/2010

10/18/2010


Figure 11. Monthly TSI values calculated for mainstem and tributary Yates and Thurlow Reservoir stations using chl a concentrations and Carlson’s Trophic State Index calculation. Monthly discharge acquired from Alabama Power at Yates Dam.

1000

2000

3000

4000

5000

6000

20

30

40

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60

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80

Apr May Jun Jul Aug Sep Oct

Ave

Disch

arge (cfs)

TSI

Yates and Thurlow Reservoirs

Discharge @ Yates Reservoir Dam

Channahatchee

Sougahatchee

Yates Lower

Thurlow Lower

Mean Monthly Discharge

Hypereutrophic

Oligotrophic

Eutrophic

Mesotrophic


REFERENCES

ADEM. 2008. Quality Management Plan For The Alabama Department Of Environmental, Alabama Department of Environmental Management (ADEM), Montgomery, AL. 58 pp.

ADEM. 2008. Quality Assurance Project Plan (QAPP) for Surface Water Quality Monitoring in Alabama. Alabama Department of Environmental Management (ADEM), Montgomery, AL. 78 pp.

ADEM. 2010 (as amended). Standard Operating Procedures #2041 In Situ Surface Water Quality Field Measurements-Temperature, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2044 In Situ Surface Water Quality Field Measurements–Turbidity, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2046 Photic Zone Measurement and Visibility Determination, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2047 In Situ Surface Water Quality Field Measurements–By Datasonde, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2061 General Surface Water Sample Collection, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2062 Dissolved Reactive Phosphorus (DRP) Surface Water Sample Collection and Field Processing, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2010 (as amended). Standard Operating Procedures #2063 Water Column Chlorophyll a Sample Collection and Field Processing, Alabama Department of Environmental Management (ADEM), Montgomery, AL.

ADEM. 2012. State of Alabama Water Quality Monitoring Strategy June 19, 2012. Alabama Department of Environmental Management (ADEM), Montgomery, AL. 88 pp. http://www.adem.alabama.gov/programs/water/wqsurvey/2012WQMonitoringStrategy

Alabama Department of Environmental Management Water Division (ADEM Admin. Code R. 335-6-10-.09). 2010. Specific Water Quality Criteria. Water Quality Program. Chapter 10. Volume 1. Division 335-6.

Alabama Department of Environmental Management Water Division (ADEM Admin. Code R. 335-6-10-.11). 2010. Water Quality Criteria Applicable to Specific Lakes. Water Quality Program. Chapter 10. Volume 1. Division 335-6.


American Public Health Association, American Water Works Association and Water Pollution Control Federation. 1998. Standard methods for the examination of water and wastewater. 20th edition. APHA, Washington, D.C.

Carlson, R.E. 1977. A trophic state index. Limnology and Oceanography. 22(2):361-369.

Lind, O.T. 1979. Handbook of common methods in limnology. The C.V. Mosby Co., St. Louis, Missouri. 199 pp.

Raschke, R.L. and D.A. Schultz. 1987. The use of the algal growth potential test for data assessment. Journal of Water Pollution Control Federation 59(4):222-227.

Raschke, R. L., H. S. Howard, J. R. Maudsley, and R. J. Lewis. 1996. The Ecological Condition of Small Streams in the Savannah River Basin: A REMAP Progress Report. EPA Region 4, Science and Ecosystem Support Division, Ecological Assessment Branch, Athens, GA.

U.S. Environmental Protection Agency. 1990. The lake and reservoir restoration guidance manual. 2nd edition. EPA-440/4-90-006. U.S.E.P.A. Office of Water. Washington, D.C. 326 pp.

Welch, E.B. 1992. Ecological Effects of Wastewater. 2nd edition. Chapman and Hall Publishers. London, England. 425 pp.

Wetzel, R.G. 1983. Limnology. 2nd edition. Saunders College Publishing. Philadelphia, Pennsylvania. 858 pp.


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APPENDIX


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Appendix Table 1. Summary of water quality data collected April-October, 2010. Minimum (Min) and maximum (Max) values calculated using minimum detection limits (MDL) when results were less than this value. Median (Med), average (Ave), and standard deviations (SD) values were calculated by multiplying the MDL by 0.5 when results were less than this value.

Station Parameter N Min Max Med Avg SD THUE-1 Physical

Turbidity (NTU) 7 2.6 6.6 5.2 5.0 1.4

Total Dissolved Solids (mg/L) J 7 22.0 42.0 36.0 34.6 7.2

Total Suspended Solids (mg/L) J 7 < 1.0 4.0 1.0 1.5 1.3

Hardness (mg/L) 4 8.5 10.6 9.7 9.6 0.9

Alkalinity (mg/L) 7 9.4 20.6 11.3 13.0 4.0

Photic Zone (m) 7 3.67 5.56 4.60 4.63 0.62

Secchi (m) 7 1.41 2.43 2.00 2.02 0.34

Chemical

Ammonia Nitrogen (mg/L) 7 < 0.021 0.021 0.010 0.010 0.000

Nitrate+Nitrite Nitrogen (mg/L) 7 0.117 0.220 0.175 0.173 0.040

Total Kjeldahl Nitrogen (mg/L) 7 < 0.080 0.325 0.208 0.212 0.098

Total Nitrogen (mg/L) 7 < 0.245 0.462 0.428 0.384 0.084

Dissolved Reactive Phosphorus (mg/L) J 7 0.005 0.014 0.010 0.009 0.004

Total Phosphorus (mg/L) J 7 0.007 0.018 0.012 0.012 0.004

CBOD-5 (mg/L) J 7 < 2.0 2.0 1.0 1.0 0.0

Chlorides (mg/L) 7 2.0 2.1 2.1 2.1 0.1

Biological

Chlorophyll a (ug/L) 7 1.42 9.61 4.81 4.70 2.92

E. coli (mpn/100mL) J 3 2 4 3 3 1

YATE-1 Physical

Turbidity (NTU) 7 2.8 7.0 6.4 5.6 1.7

Total Dissolved Solids (mg/L) 7 28.0 42.0 36.0 36.3 5.1

Total Suspended Solids (mg/L) 7 < 1.0 3.0 1.0 1.6 1.1

Hardness (mg/L) 4 10.5 11.3 10.7 10.8 0.4

Alkalinity (mg/L) 7 11.0 15.9 13.1 13.3 2.0

Photic Zone (m) 7 4.25 7.41 5.00 5.12 1.06

Secchi (m) 7 1.42 2.28 1.86 1.85 0.34

Chemical






Total Phosphorus (mg/L) J 7 0.006 0.015 0.011 0.011 0.003

CBOD-5 (mg/L) J 7 < 2.0 2.0 1.0 1.0 0.0

Chlorides (mg/L) 7 2.0 2.3 2.1 2.2 0.1

Biological


E. coli (mpn/100mL) J 3 < 1 1 1 1 0


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Station Parameter N Min Max Med Avg SD YATE-2 Physical

Turbidity (NTU) 7 17.0 85.1 22.0 33.8 23.9


Total Suspended Solids (mg/L) 6 10.0 31.0 19.0 20.5 8.3

Hardness (mg/L) 4 20.0 24.7 22.6 22.5 2.3

Alkalinity (mg/L) 7 27.2 38.1 32.2 32.2 4.7

Photic Zone (m) 7 0.75 2.22 1.33 1.43 0.55

Secchi (m) 7 0.28 0.93 0.59 0.57 0.20

Chemical



Total Kjeldahl Nitrogen (mg/L) 7 0.286 0.896 0.391 0.497 0.206

Total Nitrogen (mg/L) 7 0.619 1.097 0.788 0.819 0.163


Total Phosphorus (mg/L) 7 0.032 0.093 0.049 0.055 0.023

CBOD-5 (mg/L) J 7 < 2.0 3.8 1.0 1.4 1.0

Chlorides (mg/L) 7 3.1 7.4 5.6 5.1 1.6

Biological


E. coli (mpn/100mL) J 3 2 46 12 20 23

YATE-3 Physical

Turbidity (NTU) 7 9.0 64.4 15.9 27.4 22.7


Total Suspended Solids (mg/L) 6 6.0 21.0 9.0 10.7 5.5

Hardness (mg/L) 4 9.2 13.4 10.5 10.9 1.8

Alkalinity (mg/L) 7 11.2 25.7 16.7 18.3 5.8

Photic Zone (m) 7 0.96 3.40 1.87 1.95 0.83

Secchi (m) 7 0.34 1.44 0.87 0.83 0.39

Chemical






Total Phosphorus (mg/L) 7 0.012 0.040 0.026 0.027 0.010

CBOD-5 (mg/L) J 7 < 2.0 2.5 1.0 1.4 0.6

Chlorides (mg/L) 7 1.9 2.4 2.3 2.2 0.2

Biological

Chlorophyll a (ug/L) 7 < 0.10 9.61 5.34 4.77 3.67

E. coli (mpn/100mL) J 3 3 53 8 21 28

J=one or more of the values provided are estimated; < = Actual value is less than the detection limit

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